c# - Func 委托(delegate)声明的方法

Question

在非泛型类中声明这两个方法，它们共享相同的签名:

    private TypeResolverResult<T> TryRetrieveFromReusable<T>(TypeResolverConfiguration<T> typeResolverConfiguration) where T : class 
    {
        return null;
    }

    private TypeResolverResult<T> BuildNew<T>(TypeResolverConfiguration<T> typeResolverConfiguration) where T : class
    {
        return null;
    }

如何创建代表这些方法签名的委托(delegate)？

我好像无法理解，我试过了:

    private Func<TypeResolverConfiguration<T>, TypeResolverResult<T>> _typeResolveFunc;

但显然这行不通，因为该类是非泛型的，我无法更改它。

谢谢

更新

这或多或少是我需要的:

    public class Manager : ATypeResolver, IManager
    {
        private neeedDelegate;


        public Manager(RuntimeConfiguration runtimeConfiguration, IList<RepositoryContainer> repositories)
        {
            if (runtimeConfiguration.WhatEver)
            {
                neeedDelegate = TryRetrieveFromReusable;
            }
            else
            {
                neeedDelegate = BuildNew;
            }
        }

        public override TypeResolverResult<T> Resolve<T>() where T : class
        {
            //Want to avoid doing this:

            if (runtimeConfiguration.WhatEver)
            {
                TryRetrieveFromReusable(new TypeResolverConfiguration<T>());
            }
            else
            {
                BuildNew(new TypeResolverConfiguration<T>());
            }

            //and have just this

            neeedDelegate<T>(new TypeResolverConfiguration<T>());
        }

        private TypeResolverResult<T> TryRetrieveFromReusable<T>(TypeResolverConfiguration<T> typeResolverConfiguration) where T : class 
        {
            return null;
        }

        private TypeResolverResult<T> BuildNew<T>(TypeResolverConfiguration<T> typeResolverConfiguration) where T : class
        {
            return null;
        }
    }

Answer 1

更新 据我所知，只要ATypeResolver，像这样的方法应该可行。有一个 where T : class在 Resolve<T> :

public class Manager : ATypeResolver, IManager
{
    private bool tryRetrieveFromReusable;

    public Manager(RuntimeConfiguration runtimeConfiguration, IList<RepositoryContainer> repositories)
    {
        this.tryRetrieveFromReusable = runtimeConfiguration.WhatEver;
    }
    public override TypeResolverResult<T> Resolve<T>()
    {
        var typeResolver = tryRetrieveFromReusable ? (TypeResolver<T>)TryRetrieveFromReusable : BuildNew;

        return typeResolver(new TypeResolverConfiguration<T>());
    }
}

这使用自定义委托(delegate)类型(一个 Func 就像你应该工作一样):

public delegate TypeResolverResult<T> TypeResolver<T>(
    TypeResolverConfiguration<T> typeResolverConfiguration) where T : class;

喜欢的可以移步var typeResolver = ...行到它自己的方法，以分离逻辑并允许您使用它而不仅仅是 Resolve .如果这样做，Resolve 可能会像这样简单:return GetTypeResolver<T>()(new TypeResolverConfiguration<T>()); .